Question:At a game of billiards, A can give B 15 points in 60 and A can give C 20 in 60. How many can B give C in a game of 90 ? 

A 30 points 
B 20 points 
C 10 points 
D 12 points 

+ Answer
C 

+ Explanation
A : B = 60 : 45 and A : C = 60 : 40.

`:. B/C = (B/A xx A/C)`

`= (45/60 xx 60/40)`

`= 45/40 = 90/80`

`= 90 : 80`

:. B can give C 10 points in a game of 90.

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Irin Moni

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